山前平原区冲洪积软基沉降规律及处理技术研究
发布时间：2019-05-19 15:41
【摘要】：随着我国交通事业的飞速发展,人们对交通的要求由原来单纯的能够到达目的地逐渐转变为要求交通条件快捷、舒适、安全、经济以及环保。追求快捷和安全舒适使我国原来修建的双向四车道高速公路的弊端变得越来越突出。原来修建的双向四车道高速公路很多面临改扩建,因此需要急切解决的棘手问题也会慢慢暴露出来。软土地区地基的沉降是影响高速公路质量的一项重要因素,对改扩建更是如此。软土地区的高速公路地基沉降预测是软土地区高速公路建设急需解决的一项技术问题。软土地区地基处理技术研究也是目前的一个热门领域。本文依托京石高速改扩建,进行了如下工作:(1)总结了目前国内软基沉降预测的一些研究成果。介绍了国内外高速公路改扩建研究现状。分析京石高速的重要意义,如今改扩建是大势所趋;(2)分析了软土的工程特性以及所依托工程的软土分布以及特性;(3)简述了目前沉降预测的类型以及各种拟合曲线的机理;(4)采用PLAXIS软件CFG桩网复合地基进行了数值模拟,并与实测值做了对比分析;(5)通过现场实测数据运用双曲线法预测中期沉降。采用双曲线法、皮尔曲线法以及指数曲线法预测地基后期沉降,然后再与实测值进行对比分析,以期找到预测后期沉降的最优方法;(6)对不同的地基处理方式效果进行了对比研究。
[Abstract]:With the rapid development of transportation in our country, people's requirements for traffic have gradually changed from simply being able to reach their destination to requiring fast, comfortable, safe, economic and environmental protection. The pursuit of rapidity and safety and comfort makes the drawbacks of the two-way four-lane highway built in our country become more and more prominent. Many of the original two-way four-lane highways are facing reconstruction and expansion, so the thorny problems that need to be solved urgently will be slowly exposed. The settlement of foundation in soft soil area is an important factor affecting the quality of expressway, especially for reconstruction and expansion. The prediction of highway foundation settlement in soft soil area is an urgent technical problem to be solved in highway construction in soft soil area. The research of foundation treatment technology in soft soil area is also a hot field at present. Based on the reconstruction and expansion of Jingshi high speed, the following work has been done in this paper: (1) some research results of soft foundation settlement prediction in China are summarized. This paper introduces the research status of highway reconstruction and expansion at home and abroad. It is the general trend to analyze the significance of Jingshi high speed. (2) the engineering characteristics of soft soil and the distribution and characteristics of soft soil are analyzed. (3) the types of settlement prediction and the mechanism of various fitting curves are briefly described. (4) the numerical simulation of CFG pile net composite foundation is carried out by using PLAXIS software, and the results are compared with the measured values. (5) the hyperbolic method is used to predict the medium-term settlement through the field measured data. The hyperbolic method, the Peel curve method and the exponential curve method are used to predict the late settlement of the foundation, and then the results are compared with the measured values in order to find the optimal method to predict the late settlement. (6) the effects of different foundation treatment methods are compared and studied.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1
本文编号：2480843
[Abstract]:With the rapid development of transportation in our country, people's requirements for traffic have gradually changed from simply being able to reach their destination to requiring fast, comfortable, safe, economic and environmental protection. The pursuit of rapidity and safety and comfort makes the drawbacks of the two-way four-lane highway built in our country become more and more prominent. Many of the original two-way four-lane highways are facing reconstruction and expansion, so the thorny problems that need to be solved urgently will be slowly exposed. The settlement of foundation in soft soil area is an important factor affecting the quality of expressway, especially for reconstruction and expansion. The prediction of highway foundation settlement in soft soil area is an urgent technical problem to be solved in highway construction in soft soil area. The research of foundation treatment technology in soft soil area is also a hot field at present. Based on the reconstruction and expansion of Jingshi high speed, the following work has been done in this paper: (1) some research results of soft foundation settlement prediction in China are summarized. This paper introduces the research status of highway reconstruction and expansion at home and abroad. It is the general trend to analyze the significance of Jingshi high speed. (2) the engineering characteristics of soft soil and the distribution and characteristics of soft soil are analyzed. (3) the types of settlement prediction and the mechanism of various fitting curves are briefly described. (4) the numerical simulation of CFG pile net composite foundation is carried out by using PLAXIS software, and the results are compared with the measured values. (5) the hyperbolic method is used to predict the medium-term settlement through the field measured data. The hyperbolic method, the Peel curve method and the exponential curve method are used to predict the late settlement of the foundation, and then the results are compared with the measured values in order to find the optimal method to predict the late settlement. (6) the effects of different foundation treatment methods are compared and studied.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1
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